Mechanism for heating articles prior to deforming



Oct. 17, 1961 P, s. VQSBIKIAN ETAL 3,005,085

MECHANISM FOR HEATING ARTICLES PRIOR TO DEFORMING Filed Jan. 7, 1960VIII/A PM 3 4 B ATTO RN EY United States Patent ce 3,005,085 MECHANISMFOR HEATING ARTICLES PRIQR T0 DEFORMING Peter S. Vosbikian and Thomas S.Vosbikian, Melrose, Pa. (20th and Oxford Sts., Philadelphia, Pa.) FiledJan. 7, 1960, Ser. No. 983 1 (llaim. (Cl. 219-50) The object of thisinvention is to devise a novel machine for heating a selected portion ofan article prior to deforming into a desired shape.

A further object of the invention is to heat an article to be deformedin such a manner that an end portion will remain relatively cool so thatit can be picked up by a bare hand for removal to a machine foraccomplishing the deforming operation.

A further object of the invention is to devise a novel construction andarrangement of a sectional head which clamps the article in position insuch a manner as to close an electric circuit by contact of the articlewith the head sections and to cause a longitudinal travel of theelectricity through the selected portion of the article.

A further object is to insulate portions of the head sections from thearticle being clamped.

With the foregoing objects and other objects in view as will hereinafterappear in the detailed description and the appended claims, ourinvention comprehends a novel machine for heating a selected portion ofan article prior to deforming the article.

It further comprehends a novel construction and arrangement of articleclamping sections with novel means for insulating end portions of thearticle whereby the electric current passes in a longitudinal directionthrough the article to be deformed.

For the purpose of illustrating the invention, we have shown in theaccompanying drawings a preferred embodiment of it which we have foundin practice to give satisfactory and reliable results. It is, however,to be understood that the various instrumentalities of which theinvention consists can be variously arranged and organized, and theinvention is not limited, except by the scope of the appended claims tothe exact arrangement :nd organization of these instrumentalities asherein set orth.

FIGURE 1 is a side elevation of a machine for heating an article priorto deforming.

FIGURE 2 is a front elevation.

FIGURE 3 is a sectional elevation taken through the head sections withan article to be heated in clamped position. I

FIGURE 4 is a section on line 4-4 of FIGURE 3.

FIGURE 5 is a section on line 5-5 of FIGURE 3.

FIGURE 6 is a schematic view showing the travel of the cooling mediumthrough the head sections.

FIGURE 7 is a sectional elevation of a modified form of head sections.

Similar numerals of reference indicate corresponding parts.

Referring to the drawings:

The invention in this case resides more particularly in the constructionand arrangement of the head sections which when clamped with an articlecloses the circuit through a selected portion of the article. These headsections have been shown as replacements for the points of aconventional spot welder having a step down transformer and a foottreadle which controls the clamping of an article between the headsections.

I Patented Oct. 17,1961

It has, therefore been deemed unnecessary to illustrate and describe infull detail the construction of the spot welder.

The machine has a body portion or framework 1 provided with a foottreadle 2 operatively connected with an upper movable arm 3 to move ittowards a stationary arm 4, said arms having their free ends inturnedtowards each other.

A heating and clamping head consists of an upper section 5 and a lowersection 6.

The upper head section 5 has a body portion in the form of an arm orcross bar 7 having an upwardly extending tubular extension 8 to receivethe terminal end of the upper arm 3, and opposite end portions haveright angle cut-outs 9 and 10 respectively to receive the upper ends ofvertically disposed end bars 11 and 12, respectively. The end bar 11 isinsulated from the cross bar 7 by insulating material 13 and aninsulating tube 14 insulates a fastening bolt 15 from the end bar 11.The end bar 12 is fixed to the cross bar 7 by a bolt 16.

The lower head section 16 has a cross bar 18 provided with an apertured,depending extension 19 for connection with the terminal end of the fixedarm 4 of the machine. The cross bar 18 has right angle cut-outs toreceive end bars 20 and 21 which project upwardly. The bar 20 is fixedto the cross bar 18 by a threaded rod 22 and nuts 23. Insulation 2'4insulates a bolt 25 from crossbar 18 and end bar 21. A stop member 27for positioning the article 28 is adjustable on the rod 22 and fixed inadjusted position by nuts 28. In order to better position the article tobe heated, the bars 11 and 12 are recessed at 17 and the bars 20 and 21at 29.

In the modified form shown in FIGURE 7 the head sections are formed ofright angle bars, the upper section having a cross bar 30 with adepending end bar 31. A second end bar 32 is secured by an insulatingbolt 33 to the cross bar 30. In a similar. manner, the lower headsection 34 has an end bar 35 secured to it by an insulated bolt 36.

The end bars 11 and 12 of the upper head section have passages 37 for acooling medium, and the bars 20 and 21 of the lower head section havecooling passages 38.

The schematic view of FIGURE 6 shows how the cooling medium passesthrough the head sections.

In the operation of the machine, the stop member 27 is set for thecurrent to be applied to a selected portion of the article. When thefoot treadle is depressed, the upper head section moves downwardly toclamp the article between the head section and to close the circuitwhich causes the current to pass to the specimenthrough cross bar 7 andend bar 12, through the selected portion of the specimen, end members 20and 21, cross bar 18 to the return point of the electric current.

The fiow of the current is in a longitudinal direction of the article orspecimen to be heated. The result is that an endportion of the articleis only slightly warm and can be picked up in the bare hand withoutinjury to the operator.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is:

Mechanism for electrically heating a portion of an article prior todeforming, comprising an upper and a lower clamping head section, eachconsisting of an outer cross bar and spaced end bars at right angles toits respective cross bar, and having their free ends forming clampingjaws, one end' bar of one head section and the diagonally opposite endbar of the othersection being insulated from their cross bar, said headsections having cooling passages for a cooling medium, a rod extendinglongitudinally from one head section, and a stop adjustable on said rodto selectively position a work piece between said clamping jaws, saidhead sections having terminals for an electric circuit and said circuitbeing closed by the clamping of a workpiece between the clamping aws.

References Cited in the file of this patent UNITED STATES PATENTSBartlett Dec. 31, 1912 Hopkins Sept. 24, 1935 Gasper Oct. 29, 1940FOREIGN PATENTS Great Britaim' Jan. 11, 1935 Germany Apr. 27, 1928

